Training data without the training regime is useless. A cake is not open source because they list the ingredients.
Open source captures a practical utility as well as a philosophy. When those two cease to converge, the practical prerogative wins.
The correct battle would have been weights + regime. But extremists insisted on data, too, which left Meta as the only other real voice arguing with anything practical. They had open weights. I think eventually open use was negotiated and that closed the case except for the folks still arguing about how to pronounce GIF.
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Isn't open source not the ingredients but the recipe?